linux-hardening - [PATCH] clk: hisilicon: Use devm_kcalloc() instead of devm

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Date: Sun, 21 Jan 2024 15:29:46 +0100
From: Erick Archer <erick.archer@....com>
To: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Dinh Nguyen <dinguyen@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Nick Alcock <nick.alcock@...cle.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Erick Archer <erick.archer@....com>,
	linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] clk: hisilicon: Use devm_kcalloc() instead of devm_kzalloc()

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific devm_kcalloc() function instead of the
argument size * count in the devm_kzalloc() function.

Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1]
Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Erick Archer <erick.archer@....com>
---
 drivers/clk/hisilicon/clk-hi3559a.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/clk/hisilicon/clk-hi3559a.c b/drivers/clk/hisilicon/clk-hi3559a.c
index ff4ca0edce06..da476f940326 100644
--- a/drivers/clk/hisilicon/clk-hi3559a.c
+++ b/drivers/clk/hisilicon/clk-hi3559a.c
@@ -461,8 +461,7 @@ static void hisi_clk_register_pll(struct hi3559av100_pll_clock *clks,
 	struct clk_init_data init;
 	int i;

-	p_clk = devm_kzalloc(dev, sizeof(*p_clk) * nums, GFP_KERNEL);
-
+	p_clk = devm_kcalloc(dev, nums, sizeof(*p_clk), GFP_KERNEL);
 	if (!p_clk)
 		return;

--
2.25.1